1.	convection velocity in the x-direction.
2.	convection velocity in the y-direction.

1.2	size of the domain in the x-direction.
1.4	size of the domain in the y-direction.

1.	maximum of the two Courant numbers to be used.

32	number of mesh segments in the x-direction.
48	number of mesh segments in the y-direction.

2	number of nonzero times at which to do output
.5	first nonzero output time